As many have already stated. People don't form static groups for primals mostly because those who want static groups are typically already in a static group for coil/progression content. Many static groups started working on this content as soon as it was released.

Unfortunately for those with less free time or not on the cutting edge of new content, it often means that content without lockouts that don't require a huge amount of skill are going to be mostly pug based.

I would recommend that you try and build your own static group. A group of players with similar skill/play-style as yourself and begin working on the content. Perhaps set aside 1 day a week for primals and 2 days for coil progression?

Lastly, one thing I've noticed with learning groups...if you say your learning phase C then many of your recruits will be players who are working on phase B in an attempt to get to the next level. Not much you can do about it except for setting harsher restrictions on people your recruiting.